<!DOCTYPE html>
<title>drag &amp; drop - microdata with nested parent itemref loop</title>
<style>
  body > div {
    height: 200px;
    width: 200px;
    background-color: orange;
    position: absolute;
    top: 8px;
    left: 8px;
  }
  body > div *, span {
    display: none;
  }
  body > div + div {
    background-color: navy;
    left: 250px;
  }
  body > div + div + div {
    background-color: fuchsia;
    left: 500px;
  }
  p:first-of-type {
    margin-top: 220px;
  }
</style>

<script>

function makeEl(eltype,props,contents) {
  var elem = document.createElement(eltype);
  for( var i in props ) {
    if( props.hasOwnProperty(i) ) {
      elem.setAttribute(i,props[i]);
    }
  }
  if( contents ) {
    elem.innerHTML = contents;
  }
  return elem;
}

var orange, fails = [], doneonce = false;
window.onload = function() {
  orange = document.getElementsByTagName('div')[0];

  orange.ondragstart = function(e) {
    e.dataTransfer.effectAllowed = 'copy';
    e.dataTransfer.setData('Text', 'dummy text');
    var err;
    if( err = checkprops(e.dataTransfer.getData('application/microdata+json')) ) {
      fails[fails.length] = e.type + ' ' + err;
    }
  };
  orange.nextSibling.ondragenter = orange.nextSibling.ondragleave = orange.nextSibling.ondragover =
  orange.ondrag = orange.ondragend = function(e) {
    if( e.type == 'dragover' || e.type == 'dragenter' ) {
      e.preventDefault();
      e.dataTransfer.dropEffect = 'copy';
    }
    if( e.dataTransfer.getData('application/microdata+json') ) {
      fails[fails.length] = e.type + ' unexpectedly had microdata (security restriction)';
    }
  };
  orange.nextSibling.ondrop = function(e) {
    var err;
    if( err = checkprops(e.dataTransfer.getData('application/microdata+json')) ) {
      fails[fails.length] = e.type + ' ' + err;
    }
    if( e.type != 'drop' ) { return; }
    if( doneonce ) { return; }
    doneonce = true;
    setTimeout(function () {
      document.getElementsByTagName('p')[0].innerHTML = fails.length ? ( 'FAIL: ' + fails.join('<br>') ) : 'PASS';
      fails = [];
    }, 200 );
  };

};
function checkprops(md) {
  // http://dev.w3.org/html5/md/#extracting-json
  //"If value is an item, then: If value is in memory, then let value be the string "ERROR"."
  /*
Loop detection happens only after the loop has been created, at which point it returns a property value
of "ERROR" instead of the value which has already been encountered on the stringifying stack.
Should create the following construct:
{
  items:[
    {
      properties:{
        foo:[
          {
            properties:{
              bar:[
                {
                  properties:{
                    foo:[
                      "ERROR"
                    ]
                  }
                }
              ]
            }
          }
        ]
      }
    }
  ]
}
  */

  var i;
  if( !md ) { return 'no microdata'; }
  md = JSON.parse(md);
  if( !md.items ) { return 'no items'; }
  if( md.items.length != 1 ) { return md.items.length+' items instead of 1'; }
  if( !md.items[0].properties ) { return 'no items[0].properties'; }
  if( !md.items[0].properties.foo ) { return 'no items[0].properties.foo'; }
  if( md.items[0].properties.foo.length != 1 ) { return 'items[0].properties.foo length '+md.items[0].properties.foo.length+' instead of 1'; }
  if( !md.items[0].properties.foo[0].properties ) { return 'items[1].properties.foo[0].properties <i>'+md.items[0].properties.foo[0].properties+'</i> instead of object'; }
  if( !md.items[0].properties.foo[0].properties.bar ) { return 'items[1].properties.foo[0].properties.bar <i>'+md.items[0].properties.foo[0].properties.bar+'</i> instead of array'; }
  if( md.items[0].properties.foo[0].properties.bar.length != 1 ) { return 'items[1].properties.foo[0].properties.bar.length <i>'+md.items[0].properties.foo[0].properties.bar.length+'</i> instead of 1'; }
  if( !md.items[0].properties.foo[0].properties.bar[0].properties ) { return 'items[1].properties.foo[0].properties.bar[0].properties <i>'+md.properties.foo[0].properties.bar[0].properties+'</i> instead of object'; }
  if( !md.items[0].properties.foo[0].properties.bar[0].properties.foo ) { return 'items[1].properties.foo[0].properties.bar[0].properties.foo <i>'+md.items[0].properties.foo[0].properties.bar[0].properties.foo+'</i> instead of array'; }
  if( md.items[0].properties.foo[0].properties.bar[0].properties.foo.length != 1 ) { return 'items[1].properties.foo[0].properties.bar[0].properties.foo.length <i>'+md.items[0].properties.foo[0].properties.bar[0].properties.foo.length+'</i> instead of 1'; }
  if( md.items[0].properties.foo[0].properties.bar[0].properties.foo[0] != 'ERROR' ) { return 'items[1].properties.foo[0].properties.bar[0].properties.foo.length <i>'+md.items[0].properties.foo[0].properties.bar[0].properties.foo[0]+'</i> instead of <i>ERROR</a>'; }
  return '';
}

</script>

<div draggable='true' itemscope>
  <span id='id1' itemprop='foo' itemscope><span itemscope itemprop='bar' itemref='id1'></span></span>
</div><div></div><div></div>

<p>Use your pointing device to drag the orange box to the pink box, then back to the blue box, and release it.</p>
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